Local test of Keepalived to achieve service high availability solution

Two centos systems are built using vmware locally, and keepalived is installed separately

yum install -y keepalived

Then configure

Add virtaul IP 192.168.2.245 to the machine 192.168.2.241

And set state to MASTER

# vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.2.245
    }
}

Add virtaul IP 192.168.2.245 to the machine 192.168.2.242

And set the state to BACKUP

# vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.2.245
    }
}

start up

# service keepalived start

Install nginx on two machines to test whether the failed machine is successfully transferred

Now visit http://192.168.2.245

Then I turned off the 241 machine and then visited http://192.168.2.245

We see that the IP rolls to another machine.

testing successfully.

Of course, what we are simulating is a machine failure. If it is just a problem with nginx, we can also use keepalived to monitor nginx to achieve IP switching.